星座自主运行时间同步精度测评方法研究

项目名称： 星座自主运行时间同步精度测评方法研究

项目编号： No.11303031

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 任晓乾

作者单位： 中国科学院国家授时中心

项目金额： 27万元

中文摘要： 随着卫星导航系统的发展以及导航战概念的提出，系统的自主运行已成为卫星导航领域的重要研究内容。星座自主运行时，由于长时间得不到地面测控系统支持，各卫星时间基准经过长期累计误差，导致系统可用性降低或不可用，所以研究如何对自主运行时间同步精度进行测评，对卫星导航系统星间链路建设具有重要的支撑作用。本项目提出一种基于地面验证系统的星座自主运行时间同步精度测评方法，在自发自收模式下，通过卫星地面站向可视范围内卫星发射相同载频的高精度时间信号（伪码扩频），经卫星转发器转发，同时触发卫星本地时间信号发射，卫星地面站同时接收转发信号和直发信号，通过比对信号时差，得出各卫星时间与地面基准时间的偏差，进而对星座自主运行时间同步能力进行测评。同时，该方法可在不影响卫星导航系统正常运行情况下进行，避免在有地面测控系统情况下为了评估自主运行能力而人为地长时间不给卫星注入信息而导致系统应用水平降低。

中文关键词： 星座自主运行；时间同步；测试评估；星间链路；地面试验验证

英文摘要： With the development of satellite navigation systems and navigation warfare concepts proposed, the capability of autonomous operation of the satellite navigation system has bacame an important part of the research in the field. When the navigation constellation running autonomously, each satellite time standard would bring about offset because without the support of ground for a long time, which would reduce the satellite navigation application. So, the research of the method of measuring and estimating the time synchronization accuracy under constellations autonomous operation is necessary, that could provide technical support of building satellite navigation system's inter-satellite link. this program put forward a testing and evaluation of constellation autonomous run time synchronization accuracy based on the ground testing system. Under the mode of transmitting and receiving signal itself, it transmits signal to the all satellites on the visible range by the same carrier frequency, and transmits to the same satellite ground station by satellite transponder, and triggers satellite local time to broadcast signal by the special carrier frequency. The ground station receive the two signal. It can detemine the deviation between the satellite time and ground standard time by comparing the deviation of the two sig

英文关键词： constellations autonomous operation；time synchronization；measruing and estimating；inter-satellite link；the ground testing system